google_oauth_refresh_tokens

THE RISK

Medium Risk

Why google_oauth_refresh_tokens needs a policy

This tool modifies (writes/updates) sensitive authentication tokens in persistent storage. While not destructive (tokens can be refreshed again), it changes authentication state and could affect subsequent API calls if corrupted or manipulated. The high severity reflects that token tampering could grant unauthorized access to all downstream Google services (Gmail, Calendar, Drive visible on this server).

From the tool's definition Tool name 'google_oauth_refresh_tokens' and description 'Refresh OAuth access tokens and update them in the token file' indicates modification of authentication credentials stored in a token file.

Documented attack patterns abuse exactly the kind of access google_oauth_refresh_tokens gives an agent:

POLICY

How to control google_oauth_refresh_tokens

PolicyLayer is an MCP gateway — it sits between your AI agents and Google MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for google_oauth_refresh_tokens:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "google_oauth_refresh_tokens": {
      "limits": [
        {
          "counter": "google_oauth_refresh_tokens_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

google_oauth_refresh_tokens stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Google MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

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All 35 Google MCP tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about google_oauth_refresh_tokens

What does the google_oauth_refresh_tokens tool do? +

Refresh OAuth access tokens and update them in the token file. It is categorised as a Write tool in the Google MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on google_oauth_refresh_tokens? +

Register the Google MCP server in PolicyLayer and add a rule for google_oauth_refresh_tokens: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Google MCP. Nothing to install.

What risk level is google_oauth_refresh_tokens? +

google_oauth_refresh_tokens is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit google_oauth_refresh_tokens? +

Yes. Add a rate_limit block to the google_oauth_refresh_tokens rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block google_oauth_refresh_tokens completely? +

Set action: deny in the PolicyLayer policy for google_oauth_refresh_tokens. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides google_oauth_refresh_tokens? +

google_oauth_refresh_tokens is provided by the Google MCP server (vakharwalad23/google-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Google MCP tool call.

Start from Google MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →